You don't need to take on cryptography to fight cybercrime. Cybercrime usually leaves huge trail of evidence. Usually in form of lost money (transactions) and bricked devices.

Fighting cybercrime has different obstacles: it's usually cross-border, and its victims are usually common people. Nobody cares terribly much when a commoner loses $100. Even when there's a thousand of them.

What you need to take on cryptography, is "to snoop". Why would you need that, huh?